subs( ) command would not work

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Hello everyone,

Real simple. At the end of the following code, I am trying to substitute my symbolic variables with actual numbers. The commando seems to work(does not give me an error) but once i print the matrices, it would not show the substituted variables. Check this out:

subs(A,a,0.09);subs(A,b,0.09);subs(A,c,100);subs(A,k,4.0);subs(A,x1,1);
subs(A,x2,0);subs(A,x3,1);subs(A,x4,40);subs(A,x5,0);subs(A,x6,1);
subs(A,x7,0);subs(A,u1,.08);subs(A,u2,.04);
subs(B,a,0.09);subs(B,b,0.09);subs(B,c,100);subs(B,k,4.0);subs(B,x1,1);
subs(B,x2,0);subs(B,x3,1);subs(B,x4,40);subs(B,x5,0);subs(B,x6,1);
subs(B,x7,0);subs(B,u1,.08);subs(B,u2,.04);

where A and B are matrices and those symbolic variables are in the matrix functions